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    Management of public rangeland

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    Describe public rangelands, stating which government agencies administer them in the U.S. What is the carrying capacity of a rangeland and what results when this capacity is exceeded?

    Discuss the energy and nutrients needed for humans to have a balanced diet. Include the roles played by various biological molecules in your discussion.

    Compare the benefits and challenges of fishing and aquaculture. Which approach has a greater impact on the environment? Justify your answer.

    How would you give an intelligent answer to a person who says, "Why should I worry about the ozone layer? Today's air quality report says there is plenty of ozone around my city

    Compare and contrast point source and nonpoint source pollution. Include the following components in your comparison: sources, impact, prevention, and potential regulation of each type of pollution.

    What are two major benefits of using pesticides? If pesticide use were discontinued, what pesticide alternatives or compromises would be needed to maintain these benefits?

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    Solution Preview

    Public rangelands are administered by the Bureau of Land Management, the National Park Service, the U.S. Forest Service, and the U.S. Fish and Wildlife Service. The carrying capacity of a rangeland is the number of grazing animals which its vegetation can support. If this is exceeded, the ecosystem is damaged in some way. Generally the loss of vegetative cover occurs leads to erosion. Eventually the animals which graze on it are reduced, either voluntarily or by starvation.

    A balanced diet consists of carbohydrates, proteins, fats, vitamins, minerals, and fiber. Carbohydrates are the easiest to digest and provide quick energy. Proteins can also be used for energy, and they are essential in repairing tissues and providing immunity. Fats compose cell membranes, and vitamins play specialized roles. Some are antioxidants, helping to prevent cancer. Minerals are used in cell messaging and in building bones. Iron ...